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To enable the inverter to start directly from a specific frequency, configure the settings as follows:
Start-up Mode Configuration:
· Select the ‘Direct Start’ mode in function code P01.01 (set to 0)
· Set function code P01.02 (Direct Start Start Frequency) to the desired specific frequency
Frequency Command Configuration:
· Select the frequency command source via function code P00.06, configurable as Function Code Setting (0) or Analogue Setting (1-4)
· If Function Code Setting is selected, set the operating frequency to the specific value via P00.13
Control Mode Verification:
· Ensure the operating command channel (P00.01) is set to the correct control mode (e.g., Local Control, Communication Control)
· Upon receiving the run command, the drive will start directly from the specified frequency
This start method is suitable for applications requiring rapid attainment of a specific rotational speed. The drive will commence output directly from the set frequency without accelerating from 0Hz.

1. Check the fault history and current alarms. Review the historical fault records on the HMI, as they may reveal the root cause of the POFF condition.

2. Verify control and auxiliary power supplies. Ensure all low-voltage circuit breakers and switches in the control cabinet are closed. If a UPS is present, check its operational status. Alternatively, open the VFD control cabinet door and observe whether indicator lights for all power modules (e.g., PLC power supply, trigger power supply, drive board power supply) are lit normally (typically green indicates normal operation).

3. Verify all interlock and safety signals. An unclosed safety interlock circuit will force the system into POFF. Check external safety interlock signals on user terminals—including emergency stop, remote/local switch, fan fault, and transformer overtemperature signals—to ensure they are in normal state (typically normally open or normally closed contacts). Simultaneously confirm all cabinet doors (switchgear, transformer, control) are fully closed.

This frequency jump from 0 to a specific value is typically a parameter setting issue rather than a fault. Reset the parameters and restart to see if it resolves. Typically, parameter P01.01 sets the initial frequency during inverter startup, causing the inverter to start at the frequency specified in P01.01. Alternatively, parameters P08.08 and P08.09 may be configured to bypass undesired frequency levels and jump directly to the target frequency. These parameters can all cause the inverter frequency to jump abruptly.

If it operates normally without the motor, an under-voltage fault with the motor connected usually indicates the relay is not functioning. Power on and listen for the relay clicking into place. The relay operates on internal 24V power. If no sound is heard, disconnect the fan power cable at the top, then power on again and check for the relay clicking sound. If still absent, this indicates no internal 24V power. Replace the relay or the internal power board.

When configuring parameter P4.03, if you find that a low baud rate connects successfully but 56700 fails, this may indicate a switching frequency issue. Check P9.53. If its current value is 4k, change it to 8k before attempting connection again (P9.53 requires developer permissions; contact INVT engineers in advance if needed).

Q: How do I configure parameters to switch from PV control or three-phase utility power to single-phase utility power for single-phase output?
A: First, set parameter P15.00 to 0 to disable the PV function, ensuring the SP100 is powered by mains frequency. Set P15.39 to 0 to change the product model to single-phase power supply with single-direction output (this function code can also be used to switch the product model to match different input/output configurations). After verifying the wiring is correct, power on and start the system.

The TF card stores control parameters, system operation data and black box data. It is located on the left side of the control unit and can be used to restore parameters for a new control unit.

The TF card can be replaced after the main control unit is powered off. To avoid damaging the TF card, it should be removed before the control unit protective cover is removed.

1. Overvoltage: Fault in the voltage detection circuit; too short acceleration and deceleration; too high input voltage; peripheral issues
2. Undervoltage: Open circuit at the input end; faulty rectifier bridge or unit drive board
3.  Unit overheating: Fault in the temperature detection element; reversed rotation of the top cabinet fan; environmental problems
4. Unit fiber optic communication fault: Issues with the fiber optic board, fiber optic connector, or wiring

 ① Access control failure: The contact points of the access control switch are broken, or the S3 interface of the system IO board is faulty.
② Overheating of the phase-shifting transformer: The direction of the fan is incorrect, the temperature controller gives a false alarm, or there is too much dust in the environment.
③ Bypass cabinet action failure: The manual/automatic type setting is incorrect, or the address setting is wrong.
④ Buffer cabinet failure: The buffer contactor or the system IO board is faulty.
⑤ Frequency converter overload: The selected model is too small; the grid voltage is too low; the parameter setting is incorrect; the current detection circuit is faulty.